*{
    padding:0;
    margin:0;
}
body{
    width:100%;
    height:1500px;
}
.top{
    background-color: #007D60;
    width:100%;
    height:50px;
    vertical-align: middle;
    margin-bottom:60px;
    /*border:1px solid yellow;*/
    /*float:left;*/
    /*position:relative;*/
}
.describe{
    margin-top:10px;
    font-family: 'Microsoft YaHei';
    font-size:16px;
/*border:1px solid blue;*/
}
.top span{
    text-align: center;

}
.top span a{
    color:white;
    width:70px;
    height:50px;
    display:inline-block;
    text-decoration: none;

    font-family: 'Microsoft YaHei';
    font-size:23px;
    line-height:50px;
    margin-left:200px;
}
.top span a:hover{
    background-color:#0AAF88;;
}
.login_div{
    width:100%;
    height:1500px;
    /*border:1px solid red;*/
    position:fixed;
    top:0;
    background-color:#D3E3ED;
    opacity:0.3;
    z-index: 10;
    /*float:left;*/
}
.login {
    width: 300px;
    height: 200px;
    border: 2px solid #999999;
    border-radius: 0.2em;
    position: absolute;
    left: 0;
    top: 0;
    background-color: white;
    z-index: 100;
    /*cursor:move;*/
}
/*.login-right*/
.exit{
    color:#F1B875;
    border:1px solid #F1B875;
    border-radius: 0.1em;
    width:25px;
    height:25px;
    font-size: 16px;
    text-align: center;
    float:right;
    margin-top:5px;
    background-color: white;
    margin-right:5px;
}
.exit:hover{
    color:white;
    border:1px solid #F1B875;
    background-color:#F1B875;
    cursor:pointer;

}
.login span{
    width:84%;
    font-family: 'Microsoft YaHei';
    /*height:30px;*/
    font-size:20px;
    margin-top:5px;
    margin-bottom:10px;
    margin-left:10px;
    display:inline-block;
    cursor:move;
}
.change{
    width:10px;
    height:10px;
    /*border:1px solid red;*/
    background:url(task_3_37_1.png);
    position:absolute;
    bottom:0;
    right:0;
    cursor:se-resize;
}
.username,.pwd{
    margin-top:10px;
    margin-left:40px;
    border:1px solid #C0C0C0;
    width:75%;
    height:35px;
    border-radius:0.2em;
}
.submit{
    width:75%;
    height:35px;
    margin-top:10px;
    margin-left:41px;
    border:none;
    background-color: #0275D8;
    border-radius: 0.2em;
    color:white;
}
.bottom_div{
    border:1px solid transparent;
    width:96%;
    position:absolute;
    bottom:-1px;
    cursor:s-resize;
}
.right_div{
    border:1px solid transparent;
    height:96%;
    position:absolute;
    right:-1px;
    cursor:e-resize;
}